(4S)-4-Hydroxy-4-ethyl-7-chloro-1H-pyrano[3',4':6,7]indolizino[1,2-b]quinoline-3,14(4H,12H)-dione;(4S)-4α-Ethyl-4-hydroxy-7-chloro-1H-pyrano[3',4':6,7]indolizino[1,2-b]quinoline-3,14(4H,12H)-dione;12-Chlorocamptothecin
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